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Can you please let me know if my code is correct? I'm studying for my test in two hours so I dont really have time to write an application to test it. Question is if I have a JLabel with a number as its label. simply a label that says 34 for example. I want to extract the number from the label. but i need to handle exceptions, it's not a number, it can be a letter. would my code below handle the exception correctly? JLabel label = new JLabel"34"; int extracted; this is what i would do try{ extracted = number was "+ extracted; } catchIOException exception{ + " is not a number"; } asked Apr 9, 2009 at 1556 gold badges154 silver badges188 bronze badges Close, but catching an IOException won't work because that exception type is not thrown by the parseInt method. Try catching a NumberFormatException instead try{ extracted = number was "+ extracted; } catchNumberFormatException exception { + " is not a number"; } answered Apr 9, 2009 at 1602 Craig OtisCraig gold badges136 silver badges233 bronze badges 0 I would check the documentation for Furthermore, I'd strongly recommend setting up a test project in whatever IDE you use so you can test this stuff yourself with a rapid turnaround! Even if it's a vim/javac+make script. answered Apr 9, 2009 at 1558 Brian AgnewBrian Agnew267k36 gold badges333 silver badges440 bronze badges It's almost correct, except that you're catching the wrong exception; parseInt throws a NumberFormatException. answered Apr 9, 2009 at 1559 answered Apr 9, 2009 at 1559 cletuscletus614k168 gold badges909 silver badges942 bronze badges NumberFormatException is a RunTimeException unchecked, for compilation purposes, you don't really have to write it in the catch portion. If what you are trying to do is determine if the user will type numbers in the JTextField and not any other character, you should look at regex Regular expressions, instead of catching this one using the try .. catch mechanism. answered Apr 9, 2009 at 1608 2 You should catch NumberFormatException. Otherwise, fine. answered Apr 9, 2009 at 1559 gold badges145 silver badges179 bronze badges The javadoc for states that it can throw a NumberFormatException, not an IOException. The code you have written will not compile, because IOException is a checked exception which cannot be thrown by any of the code in the try block. answered Apr 9, 2009 at 1601 Simon NickersonSimon gold badges102 silver badges126 bronze badges answered Apr 9, 2009 at 1602 Arthur ThomasArthur Thomas5,0681 gold badge25 silver badges31 bronze badges
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